WE have one big fireworm, Eurythoe complanata, that wanders up from the south in warm water years. It's not nearly as pretty. There are two color morphs, an orange one & a greenish-gray-blue one but it doesn't have the yellow & black lines across the back or the big red tuft right behind the head.

Cheers, Leslie
So many worms, so little time
Natural History Museum of Los Angeles County